Question

Which of the following atoms has the greatest nuclear charge?

1. Al
2. Ar
3. Si
4. Na​

Answer 1

Nuclear charge is the number of protons in the nucleus.

Nuclear charge = atomic number of the atom.

The atomic numbers of your atoms are:

Al- 13

Ar- 18

Si- 14

Na- 11

Thus Ar has the greatest nuclear charge.

so your answer is 2.Ar